jQuery('.cutooltip').tooltip({ tooltipClass:"myclass" });
<!doctype html> <html lang="en"> <head> <meta charset="utf-8"> <title>tooltip demo</title> <link rel="stylesheet" href="http://code.jquery.com/ui/1.11.0/themes/smoothness/jquery-ui.css"> <script src="http://code.jquery.com/jquery-1.10.2.js"></script> <script src="http://code.jquery.com/ui/1.11.0/jquery-ui.js"></script> <style type="text/css"> .myclass { background: #FFFF00; } </style> </head> <body> <p> <a href="#" title="Anchor description">Anchor text</a> <input title="Input help"> </p> <script> $( document ).tooltip({ tooltipClass:"myclass" }); </script> </body> </html>